SCHEDULE 13D TGC INDUSTRIES, INC SERIES C 8% PREFERRED 872417209 EDWARD L. FLYNN 75-11 MYRTLE AVENUE GLENDALE NY 11385 718 386 5800 8/10/97 cusip no. 872417209 1 EDWARD L. FLYNN ###-##-#### 2 3 4 BROKERAGE ACCOUNT PF 5 6 USA 7 103881 8 9 SAME AS 7 10 11 SAME AS 7 12 13 9.03% C PFD 14 IN